Competition number

[5] Since the 2000s, track and field athletes at major competitions wear their names as well as their numbers on their bibs.

In racewalking events, competitors also must wear numbers on their backs for identification by the judges after a violation has been detected.

[6] In some types of motorsport, such as rallys, competition numbers are attached to the vehicles taking part in a specific event.

Some notable exceptions include: At the 2019 Boston Marathon, organizers gave special bib numbers to several celebrities.

Former NFL player Tedy Bruschi was given 5454, his uniform number repeated; NASCAR driver Jimmie Johnson was given 4848, his car number with Hendrick Motorsports repeated; and Joan Benoit Samuelson was given 1979, the year of her first win in the event.